// A special mask on tile. Offer a link, an optional
// grid visual, a basic description when mouse hover
// on each tile
var LGDSMask = Class.create({
  initialize: function () {
    this.visual = new LGDSElement(BASE_URL_IMG+'mask/tile_mask-grid.png');
  },
  setPos: function (x, y, z) {
    this.visual.setPos(x, y, z);
  },
  // Switch on/off the grid visual
  switchGrid: function () {
    
  }
});